import turtle as t
t.pensize(5)
t.pencolor("black")
t.fillcolor("red")
t.begin_fill()
for i in range(4):
    t.fd(100)
    t.left(90)
t.end_fill()
t.pu()
t.fd(10)
t.left(90)
t.fd(10)
t.right(90)
t.pendown()
t.fillcolor("yellow")
t.begin_fill()
for i in range(4):
    t.fd(80)
    t.left(90)
t.end_fill()
t.pu()
t.fd(10)
t.left(90)
t.fd(10)
t.right(90)
t.pendown()
t.fillcolor("blue")
t.begin_fill()
for i in range(4):
    t.fd(60)
    t.left(90)
t.end_fill()
